Cup insulating sleeve



FIG. 1 is a perspective view of a cup insulating sleeve showing my new design shaped into an operational configuration, the dashed line showing indicating environment not constituting part of my new design;

FIG. 2 is a front side elevation view thereof in an open flat condition;

FIG. 3 is a top plan view as seen from above in FIG. 2;

FIG. 4 is a rear side elevation view thereof as seen from behind in FIG. 2;

FIG. 5 is a bottom plan view as seen from below in FIG. 2; and,

FIG. 6 is an end view thereof, as seen from the right side in FIG. 2, the opposite end being substantially identical thereto. 

The ornamental design for a cup insulating sleeve, as shown and described. 